Code cleanup.

- Improved: Removed unneeded javascript from Animated Headline (Type = animation)
- Improved: Animated Headline, moved inline animation-delay to style sheet to prevent conflicts with CSS optimization.
- Improved: Layout grids and other containers configured as form, now also have 'set tab index' item in context menu to quickly set the tab-index of form elements.
- Improved: Add margin support to Video Player (Plyr) object.
- Improved: The Video Player (Plyr) object, now also supports the use of YouTube and Vimeo links, such as: https://www.youtube.com/v/K7fP_E20ooU or https://player.vimeo.com/video/763827466
- Improved: The Vimeo object now also accepts full Vimeo video URLs, not just the video ID.
- Fixed: Plyr issue with aspect ratio in YouTube and Vimeo in combination with layout grid.